Lock-nut.



No. 897,208. PATENTED AUG. 25, 1908.

J. L. KALMBACHER. LOOK NUT.

APPLICATION FILED AUG. 9, 1907.

WITNESsSEiS' .Z VENTQR h fiw 4L Jo/fw xazwww 75 yaw/16 JOHANNES LUDWIG KALMBAGHER, OF CHICAGO, ILLINQIS.

LOCK-NUT.-

' Specification of Letters Patent. Application filed August 9, 1907. SeriaI No. 387,757.

Patented Aug. 25, 1908.

To all whom it mai concern:

Be it known that I, JOHANNES LUDWIG KALMBAOHER, a subject of the Emperor of Germany, andresidlng at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Lock-Nuts, of which the following is a complete specification.

This invention relates to improvements in lock-nuts and more articularly to a lock-nut of that class in whic the nut is locked to the washer.

The object in this invention is to rovide ,a lock-nut capable of locking itsel against rotation caused by jar or vibrations of the bolt, but which may be freely turned in either direction by an ordinary wrench or other implement usua ly used for that purpose.

It is also an object of the invention to provide a very cheap and simple device capable of being used upon old bolts as well as new, it only being necessary'to provide a flattened surface on one side of the threaded portion of the bolt.

It is further an object of the invention to provide a lock-nut in which the parts are re need to a minimum, thereby greatly lessening the liability to get out of repair.

The invention consists of the matters hereinafter described in the s ecification and more fully pointed out an defined in the ap ended claims.

n the drawings: Figure 1 is a View, partly in section and artly in side elevation, of the lock-nut attac ed to a bolt. Fig. 2 is atop planview of the same. Fig. 3 is a side elevation of the washer and showing a fragmentary section of the nut. Fig. 4 isa top plan view of the washer.

As shown in said drawings. 1 indicatesthe bolt, which is provided longitudinally of its threaded portion with a flattened surface 1. In the' case of new bolts, said flattened surface may be formed in any desired manner when the bolt is made, and where it is desired to use old bolts tlfe bolts may be filed or otherwise cut down tothe proper shape.

The nut 2 may be of any'ordinar construction, but as shown it is heXagona at its outer end and round at its inner end, the latter of which is slightly larger than the former. In thoinner end or face of said nut and concentric with the bore thereof is an annular groove or channel 3, which at its bottom is provided with a plurality of rounded teeth 4, the purpose of w 'ch will be hereinafter more fully described. I A washer 5 is placed on the bolt and against which the inner face of the nut abuts. Said washer is rovided'with a central a erture, one side 0 which, 5, is straight an fits on the flattened surface 1' of the bolt, thereby preventing the washer from turning.

A resilient tongue 6 is stamped or otherwise integrally formed in said washer, concentric with the bore thereof, and is provided on its free end with a claw 6 adapted .to engage the teeth 4 of the bolt. Said tongue projects from the face of the washer adjacent the nut, and as it is formed on a circle coincident with that of the groove 3, it is free to project into said groove to engage the teeth.

The operation is as follows: When the washer is placed on the bolt it is revented from turning by the straight edge t ereof engaging the fiat surface of the bolt. When the nut is set up against the washer the tongue 6 enters the groove in the nut and the claw 6 engages the teeth 4. Inasmuch as said teeth are rounded they can be forced over the claw in either direction but the claw groove, a washer having a flat'faee in its bore adapted to engage the flat face of the bolt.

and hold the washerfrom rotation on the bolt,

a tongue on said washer, curved concentric- I ally with said groove and extending approximately half way around the bolt, and a claw on the inner face of said tongue adapted to engage saidteeth but to sli over the same when the nut is turned in cit or direction.

In witness whereof I have hereunto subscribed my name in the presenceof two wit.- nesses.

JOHANNES LUDWIG KALMBACIIER.

Witnesses:

CARL Ihnnrmq, ll.- R. WEIGLE. 

